Packing ring



T. H. LACKMAN.

PACKiNG RING.

APPLICATION FILED SEPT. 15, 1921.

l ,%13,;@9 Patented Apr. 18, 1922,

WITNESSES l/Vl/E/VTOH "ire sr rsi 'rzmonoan H. mcxmaiw, or scans, anemia.-

PACKING RING.

To allwlwmz'tmay cmwem: I Be it known thatI, Tm-zooona H. LACK- MAN, of Augusta, in the county of Richmond and State of Georgia, have invented certain new and useful Improvements in Packing Rings; and .I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enableothersskilled in-the art to which it appertains to make and use the same. p

, My object is to provide a simplel and cf ficient packing adapted for gas engine pistons.

Fig. 1 is a rin s, and

I i 2 shows two der ull compression.

Figs. 3 and 4 are, respectively, fragmentary views of. one of. the joints when the rings are under ;partial compression and when in improper relation.

The rings are assembled in superposed order and not in-concentric arrangement; Both forms are knownin the art but the main perspective view of two of the of the former kind.

Each of' the rings, 1 and 2 1s a split ring transversely cut to form beveled edges 3 with an adjacent packing element, the ring is rabbeted to form. bearing surfaces 4 and end shoulders 5.

At a'point diametrically opposite its cleft the ring is formed on it inner face with a boss 6. This boss is of length reater than the normal space between the e es 3 of the adjacent ring so that it may a ways span this space. This is true when the rings are 40 only slightly compressed as in Fig. 3 as well as when fullycompressed as in Fig. 2. But wlmtever the degree of compression there is only one opening and that is between the ends 3. Even if the two rings be improperly assembled, as in Fig. 4, this fact remains.

- Specification of Letters Patent.

Application filed September 15, 1921. Serial rings assembled arid un features of my invention reside in structures normally spaced apart. On its innerface, that is the face which is adapted to contact portions forming heal-in Patented Apr. 18, 1922. No. 500,703.

It will be noted that the boss does not constitute a stop for the ends 3; it simply covers the opening; lVhen fully compressed the ends 3 abut each other and the boss fits snugly within. the recesses formed by the rab ted portions and between the shoulders 5, formin a perfectly closed joint. In consequence make provision for expansion due, to wear of the rings and cylinder and still maintain a close union with the walls of the cylinder. When a. boss formed substantially similar to mine extends into the space between ends such as 3 and forms stops for such ends, as frequently occurs in the prior art, it is manifest that the results mentioned cannot bev attained. The only perfect closure that can result from such a construction is when tight contact exists and this. is destroyed by slight wear. Furthermore, there are necessarily two openings at a joint of that character.

Likewise where the boss is tapered or beveled my results cannot beattained because the expansion of the rin causes its ends to 70 slide alon the boss and be pressed away from'the sides of the cylinder. My boss pre- 'sents a flat surface parallel with the faces of-the rings and with the bearing surfaces 4.

I claim as my invention: A packing ring comprising a pair of. an-

'nular members each having a boss formed .on its inner face whose'mner surface is flat and parallel with the faces of the ring, and a diametrically opposite cleft with rabbeted portions at both sides thereof, said rabbcted surfaces for the inner face of the boss am extending parallel ,with the faces 'of the ring and havln end shoulders adapted to contact with sai boss under full compremion, said boss spanning the space between the ends of the adjacent ring.

THEODORE H.- LACKMAN. 

